Question

Question 4: CLO5 Write a class called Rectangle that has length and width as instance variables, a constructor with two parameter to initialize length and width, set and get methods for each variables and the following methods: a. The first method calculates and returns the value of the ratio of the length to the width of the rectangle. b. The second method determines whether a rectangle is a Square depending on the value of the ratio, which should be calculated by calling the first method. Also include A UML diagram for the previous class

Answer 1

Class Rectangle and a main function to test the code given below. Explanation given as comments within code. UML class diagram given below code. Hope this helps! (C++ language used)

#include <iostream>
#include <string>
#include <array>
using namespace std;

// this  function returns gcd (greatest common denominator) of 2 numbers. Used in Rectangle::getRatio method.
int getGcd(int x, int y) {
    // since all numbers divide 0
    if (x == 0 && y == 0)
        return 0;
    if (x == 0)
        return y;
    if (y == 0)
        return x;
    
    // if same
    if (x == y)
        return x;
    
    // if first number is bigger
    if (x > y)
        return getGcd(x - y, y);
    return getGcd(x, y - x);
}

// Rectangle class
class Rectangle {
    private:
        int length;
        int width;
        
    public:
        // parameterized constructor
        Rectangle(int length, int width) {
            this->length = length;
            this->width = width;
        }
        
        //getters and setters
        int getLength() {
            return this->length;
        }
        int getWidth() {
            return this->width;
        }
        void setLength(int length) {
            this->length = length;
        }
        void setWidth(int width) {
            this->width = width;
        }
        
        // for question a
        // method to calculate and return ratio between length and width in an int array of size 2, with numerator in [0] and denominator in [1].
        array<int,2> getRatio() {
            array<int,2> ratio;
            int gcd = getGcd(this->length, this->width);
            // to get ratio, divide length and width by gcd.
            ratio[0] = this->length / gcd; // stores numerator of ratio
            ratio[1] = this->width / gcd; // stores denominator of ratio
            // returns an int array with length in [0] and width in [1].
            return ratio;
        }
        
        // for question b
        // method that returns true if object is a square, and false if its not, making use of Rectangle::getRatio method.
        bool isSquare() {
            array<int,2> ratio = this->getRatio();
            if (ratio[0] == ratio[1]) { // this happens when 1:1 is the ratio, implying it is indeed a square.
                return true;
            } else {
                return false;
            }
        }
};

int main()
{
    // test 1 - expected output: "Ratio is 2:1" and "It is not a square"
    Rectangle r1(10, 5);
    array<int,2> ratio1 = r1.getRatio();
    cout<<"\nLength: "<<r1.getLength()<<"\tWidth: "<<r1.getWidth()<<"\n";
    cout<<"Ratio is: "<<ratio1[0]<<":"<<ratio1[1];
    if (r1.isSquare()) {
        cout<<"\nIt is a square.\n";
    } else {
        cout<<"\nIt is not a square.\n";
    }
    
    // test 2 - expected output: "Ratio is 1:1" and "It is a square"
    Rectangle r2(4,4);
    array<int,2> ratio2 = r2.getRatio();
    cout<<"\nLength: "<<r2.getLength()<<"\tWidth: "<<r2.getWidth()<<"\n";
    cout<<"Ratio is: "<<ratio2[0]<<":"<<ratio2[1];
    if (r2.isSquare()) {
        cout<<"\nIt is a square.\n";
    } else {
        cout<<"\nIt is not a square.\n";
    }
    return 0;
}

Output of the above code:


UML class diagram below.

Length: 10 Width: 5 Ratio is: 2:1 It is not a square. Width: 4 Length: 4 Ratio is: 1:1 It is a square.

Rectangle length: int width int i + + getLength C) ; int getWidth()int setLength (length: int) : void + set width (evidth: int) : void + getRatio (): array sint, 2 > tis Square(): bool +

Please refer to the screenshot of the code given below to understand the indentation of the code.

8 9 1 #include <iostream> 2 #include <string> 3 #include <array> 4 5 using namespace std; 6 7 // this function returns gcd (greatest common denominator) of 2 numbers. Used in Rectangle::getRatio method. int getGcd(int x, int y) { Il since all numbers divideo 10 if (x == 0 && y == 0) 11 return 0; 12 if (x == 0) 13 return y; 14 if (y == 0) 15 return x; 16 17 // if same 18 if (x == y) 19 return x; 20 21 // if first number is bigger 22 if (x > y) 23 return getGcd(x - y, y); 24 return getacd(x, y - x); 25 } 26 27 // Rectangle class 28- class Rectangle { 29 private: int length; int width; 32 33 public: 34 // parameterized constructor 35 Rectangle(int length, int width) { 36 this->length = length; 37 this->width = width; 38 } 30 31


39 40 41 42 43 44 45 46 47 48 //getters and setters int getLength() { return this->length; } int getWidth() { return this->width; } void setLength(int length) { this->length = length; } void setWidth(int width) { this->width = width; } 49 50 51 52 53 54 55 56. 57 58 // for question a // method to calculate and return ratio between length and width in an int array of size 2, with numerator in [@] and denominator in [1]. array<int,2> getRatio() { array<int,2> ratio; int gcd = getGcd(this->length, this->width); // to get ratio, divide Length and width by gcd. ratio[@] = this->length / gcd; // stores numerator of ratio ratio[1] = this->width / gcd; // stores denominator of ratio // returns an int array with length in [@] and width in [1]. return ratio; } 59 60 61 62 63 64 65 66 67 68 69 70 // for question b // method that returns true if object is a square, and false if its not, making use of Rectangle::getRatio method. bool isSquare() { array(int,2> ratio = this->getRatio(); if (ratio[0] == ratio[1]) { // this happens when 1:1 is the ratio, implying it is indeed a square. return true; } else { return false; 71 72 73


} } }; 74 75 76 77 78 79 80 81 82 83 84 85 86 87- 88 89 90 91 92 93 94 95 int main() { // test 1 - expected output: "Ratio is 2:1" and "It is not a square" Rectangle r1(10, 5); array<int,2> ratioi = r1.getRatio(); cout<<"\nLength: "<<r1.getLength()«<"\twidth: "<<r1.getWidth()«<"\n"; cout<<"Ratio is: "<<ratio1[@]<<":"<<ratio1[1]; if (ri.isSquare()) { cout<<"\nIt is a square.\n"; } else { cout<<"\nIt is not a square. \n"; } // test 2 - expected output: "Ratio is 1:1" and "It is a square" Rectangle r2(4,4); array<int,2> ratio2 = r2.getRatio(); cout<<"\nLength: "<<r2.getLength()«<"\tWidth: "<<r2.getWidth()«<"\n"; cout<<"Ratio is: "<<ratio2[@]<<":"<<ratio2[1]; if (r2.issquare()) { cout<<"\nIt is a square. \n"; } else { cout<<"\nIt is not a square. \n"; } return 0; } 96 - 97 98 - 99 100 101 102